Two-Dimensional Carbon-Coated Graphene/Metal Oxide Hybrids for Enhanced Lithium Storage

• DOI: 10.1021/nn303091t
• Publication Date: 2012-08-29T21:47:13Z
• Authors: Yuezeng Su; Shuang Li; Dongqing Wu; Fan Zhang; Haiwei Liang; Pengfei Gao; Chong Cheng; Xinliang Feng
• Keywords: Carbon fibers

Metal oxides (MOs) have been widely investigated as promising high-capacity anode material for lithium ion batteries, but they usually exhibit poor cycling stability and rate performance due to the huge volume change induced by alloying reaction with lithium. In this article, we present a double protection strategy fabricating two-dimensional (2D) core-shell nanostructure improve electrochemical of metal in storage. The 2D architecture is constructed confining well-defined graphene based nanosheets (G@MO) within carbon layers. resulting carbon-coated graphene/metal (G@MO@C) inherit advantages graphene, which possesses high electrical conductivity, large aspect ratio, thin feature. Furthermore, shells can tackle deformation MO nanoparticles while keeping overall electrode highly conductive active As result, produced G@MO@C hybrids outstanding reversible capacity excellent storage (G@SnO(2)@C, 800 mAh g(-1) at 200 mA after 100 cycles; G@Fe(3)O(4)@C, 920 cycles).